Tourists view a memorial to the astronauts that have perished in pursuit of space exploration.  On the top row are the crewmembers of the ill-fated Space Shuttle Challenger, below them rests the crew of Apollo I.   Mike Lynaugh

October 29, 2010 - Tourists view a memorial to the astronauts that have perished in pursuit of space exploration.  On the top row are the crewmembers of the ill-fated Space Shuttle Challenger, below them rests the crew of Apollo I.

Mike Lynaugh